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PCI-E 3.0 stuck at x4 Speeds

post #1 of 3
Thread Starter 
So I recently purchased a new motherboard and CPU, in the manual it says that the motherboard has 2 PCI-E x16 (pci 3.0 when running with Ivy Bridge CPU which is what I have) slot but when in dual mode it runs at x8/x8.

My PCI-E 2 is running at x4 speeds and my PCI-E 3 is running at x8. How can I change the x4 speed up to x8 like it says in the manual.

System Specs:
CPU: i7 3770k @Stock speeds (3.5ghz)
Mobo: ASRock z77 Extreme 4 (Running the latest Bios)
RAM: 16GB Corsair Vengeance (XMP profile)
Graphics: 2GB XFX 6950 PCI-E 2.1 & 1GB XFX 6950 PCI-E 2.1 (with crossfire bridge)
PSU: Corsair GS800 (800W)

I have looked in the Bios to see if there is a setting I could change to get x8 speeds, I changed the bus lanes to PCI-E 2.0 from 3.0 and still no change in the x4 speed. I also upgraded to the latest Bios from P2.50 to P2.80. I have taken a card out from PCI-E 3 and ran only one lane and still only getting x4 speeds.

I have tested my cards on metro 2033 and have gotten some crazy results.
First I was just checking out what I would get in crossfire on max settings with PhysX turned off I was getting about 30 FPS which is a massive drop from to what I was getting on my old build. I though it must be the 1GB card bottlenecking the 2GB card. So i decided to check what the performance would be like when i disable crossfire and i was hitting between 60-80 FPS. Now I decided to check out the performance with PhysX turned on and boom straight back down to 30 FPS. disabled it again and FPS stayed down at 30. I am not sure if its the PCI-E lane not waking up from a power saving state as I once had a burst of frames in one of my tests ( at this time i didn't check my PCI-E's lane speed and I am unable to replicate the results.

When one card it plugged into the PCI-E 2 it runs at x4 speeds and whenI crossfire It stays at x4 and x8. What gives its suppose to be x8/x8. I have seen similar problems that people have run into with this board where they are stuck at running x8 speeds and not x16 on a single slot.

I have also tried this with an i7 3770 and got the same results and my 3770k. I check Both CPU's for bent pins and they are both fine.

A friend of mine also purchased the same motherboard and is running it with i5 3570k @4.5GHz with one card plugged into the PCI-E and he is getting PCI-E 3.0 x16 speeds.

Just for some background on my old build and the performance I used to see.
AMD 8150
MSI 990FXA-GD80
same graphics cards and ram

On Metro 2033 I would be putting over 60 FPS on maxed settings with PhysX turned off.
post #2 of 3
It seems like you have tested everything already, but you need to confirm that it is your motherboard that is the problem. If both cards are running slower in in one particular PCIE slot, you may have found the problem in the motherboard.

I need to point out the elephant in the room by saying that you crossfiring a 1gb and 2gb card does not help the situation much
, but they still should be stable. Test out both cards again on each PCIE slot separately to rule out the cards. If they are both running at x4 in PCIE slot 2 as you say, its your board at fault. Inspect the board again to see if the PCIE lane is connected firmly to the board, and if (heaven forbid) there is something in the lane itself. If one particular card is running at x4 in both slots, make sure that that card is not damaged (scratched connection, etc). What are you using to check the speed (I assume gpu-z)?

Based off what you are saying, Im leaning toward a motherboard defect, in which you need to pursue an RMA. Make sure you test diligently though (maybe another game besides metro 2033), as you want to make sure you dont have to RMA unless you necessarily have to.

A few additional questions:
1. What drivers are you running? Try reinstalling them with one card in, and then again after you have both cards in (long shot).
2. Is your cfx bridge damaged?
3. Are you using any of the PCIE 2.0 x 1 slots while in crossfire?

Good luck troubleshooting.

Lastly, welcome to OCN thumb.gif
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post #3 of 3
Thread Starter 
Quote:
Originally Posted by V1ct1m1z3r View Post

It seems like you have tested everything already, but you need to confirm that it is your motherboard that is the problem. If both cards are running slower in in one particular PCIE slot, you may have found the problem in the motherboard.

I need to point out the elephant in the room by saying that you crossfiring a 1gb and 2gb card does not help the situation much
, but they still should be stable. Test out both cards again on each PCIE slot separately to rule out the cards. If they are both running at x4 in PCIE slot 2 as you say, its your board at fault. Inspect the board again to see if the PCIE lane is connected firmly to the board, and if (heaven forbid) there is something in the lane itself. If one particular card is running at x4 in both slots, make sure that that card is not damaged (scratched connection, etc). What are you using to check the speed (I assume gpu-z)?

A few additional questions:
1. What drivers are you running? Try reinstalling them with one card in, and then again after you have both cards in (long shot).
2. Is your cfx bridge damaged?
3. Are you using any of the PCIE 2.0 x 1 slots while in crossfire?

Good luck troubleshooting.

Lastly, welcome to OCN thumb.gif

Ok so i tried putting both cards in each slot separately and together and both cards are running at x4 in PCIE2 and x8 in PCIE3 so that rules out the cards being the problem. With only one car plugged in it should be hitting x16 Speeds. And ye i don't have anything else plugged into the other PCI slots so they should be running at full speed. The drivers I'm using are the latest one (13.5).

Cards do seem clean and so does the PCI lanes. I was checking with GPU-Z and in CCC.

I think at this point I have tried everything so the board must be faulty. So I'm planning on returning it tomorrow for a MSI Z77A-GD55.

Thanks for the help. But like you said I think I have tried everything but I was hoping that it was something that I missed or overlooked.
Edited by Kxos - 5/26/13 at 6:56pm
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